jonahgao opened a new pull request, #11423:
URL: https://github.com/apache/datafusion/pull/11423
## Which issue does this PR close?
Closes #11414.
## Rationale for this change
The query in the issue generates the following plan after some optimizations.
```sql
select * from t1 inner join t2 on null right join t3 on true;
```
```sh
Projection: t1.v1, t2.v1, t3.v1
Right Join:
Inner Join:
Filter: Boolean(true) AND NULL
TableScan: t1
TableScan: t2
TableScan: t3
```
When the `simplify_expressions` rule attempts to simplify `Boolean(true) AND
NULL`, it fails because the operand types on both sides are different
(`DataType::Boolean` vs `DataType::NULL`).
The fix is to cast the NULL type to Boolean type.
## What changes are included in this PR?
## Are these changes tested?
Yes
## Are there any user-facing changes?
No
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